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%  Created by Edmund Chu on 2011-01-19.
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\title{Senior Project}
\author{Edmund Chu}
\date{}

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\section*{Introduction and Background}

The objective of augmented reality is to superimpose virtual objects on the real world, such that these virtual objects appear to be a part of the real world. These objects are often sensory enhancements. The applications for augmented reality are varied, ranging from entertainment to job and military training. Much progress has been made in the creation of dedicated AR devices, such as head-mounted displays. Common consumer electronics have recently become powerful enough to host AR systems, and AR software can now be found even on smartphones.

Despite this progress in technology, it is still a difficult problem to seamlessly integrate virtual and real objects. Establishing visual consistency is vital. Proper occlusion of virtual objects contributes greatly to such consistency. With occlusion handling, a real object may pass between the user of the system and the virtual object, with the result that the real object obscures the virtual object.

Several approaches have been developed; the most notable of these are the model-based and depth-based approaches. In the model-based approach, the model of the physical object that obscures the virtual object must be known. However, this approach is often only applied to static scenes. Depth-based approaches require the creation of a depth map to determine the location of objects in relation to each other, but requires expensive equipment---namely, stereo cameras---to function.

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